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Statements of Consolidated Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statements of Consolidated Comprehensive Income [Abstract]      
NET INCOME $ 29,286 $ 30,984 $ 23,008
Other comprehensive income, net of tax:      
Gain on pension curtailment 3,899 0 0
Gain (loss) on unfunded pension obligations (2,670) (3,825) 157
Foreign currency translation adjustment 1,680 (7,460) 5,028
Recognized net actuarial loss 466 256 174
Other comprehensive income (loss), net of tax 3,375 (11,029) 5,359
Less: Other comprehensive income, net of tax attributable to noncontrolling interest 19 (50) (433)
Total comprehensive income $ 32,680 $ 19,905 $ 27,934